Add unique ID to ecobee sensor

homeassistant/components/sensor/ecobee.py

@@ -63,6 +63,11 @@ class EcobeeSensor(Entity):
         """ Returns the state of the device. """
         return self._state
 
+    @property
+    def unique_id(self):
+        """Unique id of this sensor."""
+        return "sensor_ecobee_{}_{}".format(self.type, self.index)
+
     @property
     def unit_of_measurement(self):
         """ Unit of measurement this sensor expresses itself in. """